Manufacture of wing-nut blanks



A. MUFF.

MANUFACTURE OF WING NUT BLANKS.

APPLICATION FILED SEPT-8,1920.

1395,7620 mum Nov. 12, 19210 2 2f Maj rye A fra/F/vixs ADAM MUZ'ZF, F BUFFALO, NEW YQBK.

. MANUFACTURE OF WING-NUT BLANKS.

Specification oi Letters Patent.

Patented Norma ll, seen llppliostlon filed september e, rose. serial no. scenes.

:t'acture 0i blanks from which wing nuts are formed.

Heretotore, wing nuts have been mode by drop forging and then drilling and top ping the blanks. Certain objections to this method are that the "process precludes the manufacture of wing nuts of steel, the metal of which the blanks are made is usually relatively soft with the result that in certain uses the threads of the nut ere eesily stripped. Furthermore, the drop forgings ere relatively expensive, es according to the present methods only about four to eight nut blanks may be formed st a host, it being necessary for the operator of the drop forgrcschine to return the bar, from which the blanks are being -forged, to the furnace "for reheating when that number of blanks have been formed. This results in comperetively high labor costs due to the time lost in removing the here from the machine and inserting heated hers from the furnace. After the blenlrs have been formed they are trimmed and tumbled to smooth oh the rough surfaces and then ground to cut sway the ridges thereon "end then drilled end. topped.

One of the objects of the present invention is to provide for the'manufscture of wing nut blanks of steel or other herd motel; also to provide s novel blenk bar of steel or other metal from which the wing nut blanks may be reudily formed, endelso to substantially reduce the number of operations required to form the wing nut blanks.

Other objects are to reduce the cost ct nienutecture of wing nut blanks and to pro vide improvements in the munutscture thereof in the other respects hereinafter described end set forth in the claims.

in the accompanying drawings?- Figure l L is e tregmentar perspective view or" a nut forming blank her according to the invention Fig. 2 is e tregrnentary plan "of the blank of Fig. lrindicating the lines along which the nut blanks are cut.

3 is on end view thereof.

Fig. e is a perspective view oien unlinlshed nut blank made according to, the invention.

. Figs. 5 and 6 are respectively side elevations and bottom plan views of s finished wing nut blank, made according to the inventlon.

Briefly stated, the invention contemplates the manufacture of wing nut blanks from bar metal by rolling or otherwise forming a blunk bar or strip from which a plurality of finished nut blanks may be stamped or cut and permits of wing nut blanks being readily formed or steel or other hard metals.

Referring to the druwin s:-

According to the invention there is pro vided u motel blank bar or strip This blenk bur may be shaped in any suitable and known wey as by rolling, etc. The blank her A comprises a longitudinal sxiel portion 10 end side flenge portions 11. The blenk her A, which may be of sny suitable length, is then passed through at stomping or cutting machine end transversely cut or sheared on the lines indicated in Fig. 9:, thereby forming a plurality oi nut blanks 12. It is preferred that the blank her be out or sheared as on lines 13 indicated in Fig. 2, the axial portion being cut trend versely and the flanges or web portions ercuntely and at an angle to seid transverse cut. es by such cutting the ears or wings it of the nuts are properly formed end there is no substantial waste of the motel oi the bar in cutting, the upper edges of one of the nut blanks forming the lower edges of the next nut blank, although it is contemplated thst the flanges may be out along other lines, if desired.

The uniel portion 10 of the blank bar is shown as bein enlarged and substantially cylindricsl in rorm, or substantially circular in cross section, and the side flanges being lid Kilt) shown as reduced redial, diametrically opposed webs, but the invention is in nowise limited to these particular shapes or proportions, es the smell portion may be of any other desired forxm the requirement being that the mini portion be of sufficient thickness to be drilled end topped and constitute the bodies 15 of the wing nut blanks. The flanges lining also he of other shoes or proportion en rney be disposed in dierent relations to each other and to the axial portion, and while two flanges are shown in the embodiment illustrated, more than two flanges may be provided, if desired.

After the nut blanks have been cut or sheared from the bar they are in the form illustrated in Fig. 4:. v The edges of the body and wings are sharp and clean cut on one side, and slightly'burred on the other side and the body portion is substantially of cylindrical shape. In order to round off the sharp edges and shape the body to the frustoconical shape desirable in the finished blank,

the unfinished blanks are then put through a press, the dies of which bevel or round the edges of the wings and the upper part of the body and upset the body, leaving the body in the frusto-conical form illustrated in Fig. 5' having a central axial a erture or recess 16 indicating the point :tor center drilling and tapping.

After the nut blanks have been sheared or v stamped and shaped, they may be drilled cost of making wing nuts in accordance with this method is less than the cost of those made by the usual forging process. Furthermore, nut blanks made according to this invention facilitate drilling and tapping of the finished nut blanks, are more uniform in proportions, smoother, and mate free from flaws than when made according to practices heretofore in use.

I claim as my invention 1. A method of manufacturing wing nut blanks, consisting in formin a bar of metal having a longitudinal axia enlarged poraperture in one side thereof.v

messes tion and flange portions off reduced cross section extending outwardly therefrom, and cutting said bar into short pieces insuch, a manner that the enlarged portion thereof will be cut substantially at right angles to the length of said bar and the flange ortions will be cut at an angle to said right angled cut.

2. A method of manufacturing wing nut blanks, consisting in forming a bar of metal having a longitudinal axial enlarged portion and flange portions of reduced cross section extending outwardly therefrom, and cutting said bar into short pieces forming wing nut blanks, said pieces being out so that the enlarged portion of the bar will form the bodies of the wing 'nut blanks and the flanges of the bar will form the wings of said blanks, said bar being out so that the edges of said wing nuts extend at an angle to the body portions.

3. A method of manufacturing wing-nut blanks, consisting in providing a bar of metal having a longitudinal, axial portion and flange portions of reduced cross section extending outwardly therefrom, cutting said form the wings of said blanks, and pressing and provide body portions'of substantially frusto-conical shape each with a .central Witness my hand, this 4th day of I September, 1920. V v 

